The word retractile is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 14
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (33 words)
alerter, article, attirer, caterer, cattier, citrate, clatter, clearer, clitter, critter, earlier, erratic, iterate, lattice, rattier, rattler, realter, recital, reciter, recrate, relater, retitle, retrace, retract, retreat, retrial, tactile, tearier, terrace, tertial, trailer, treacle, treater